Narrow strip winding method

Abstract

A method of winding a narrow strip having a width W on a bobbin at an angle theta to the rotational axis of the bobbin and at a pitch P, while the bobbin and the strip are being relatively traversed over an axial stroke S of the bobbin, characterized in that setting the integral part as A and the decimal part as B of the calculated numerical value of rotational number n the bobbin per reciprocating traverse of the bobbin or strip which is expressed according to the formula n=2 S/P, the winding is carried on, in the case when P<2W/sin theta , while controlling at least any one of P, S, and (P-W/sin theta ) so that (1-W/P sin theta )<B<W/P sin theta . Thus, A narrow strip can be soundly wound on a bobbins while avoiding any collapse or other disorder in winding or any damage of the strip by adjusting the value of B that depends delicately upon the values of P and S.

What we claim is: 
     
       1. A method of winding a narrow strip having a width W on a cylindrical bobbin having a central axis of rotation, said strip being wound at an angle θ to the axis of the bobbin and at a pitch P, comprising the steps of moving said bobbin and said strip reciprocally relative to each other back and forth along the axis of the bobbin over an axial stroke distance S while winding said strip on said bobbin, and   rotating said bobbin a number of turns equal to n for each reciprocating stroke S of said bobbin or strip, said number n having an integer part A and a decimal part B, said number n being expressed according to the formula n=2S/P, where P<2W/ sin θ while controlling at least one of P, S, and (P-W/ sin θ) so that (1-W/P sin θ)<B<W/P sin θ.   
     
     
       2. A method according to claim 1, in the case when (P-W/ sin θ)/W is not greater than 1/3, wherein at least one of P and (P-W/ sin θ) is controlled so that 0.25≦B≦0.75.